A person covers first 25 km in 60 minutes and next 38 km in 30 minutes. What is the average speed for the whole journey?

46 km/hr 49 km/hr 42 km/hr 36 km/hr

42 km/hr

Average speed = $\frac{total\; distance}{total\; time}$                       = $\frac{25+38}{1.5}$                        = $\frac{63}{1.5}$ = 42 km/hr